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Financial instruments - Long-term Energy Derivative Contracts (Detail) - Cash flow hedge | Dec. 31, 2021 MWh $ / MWh $ / MWh
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Illinois Hub, Expiry September 2030 |
Derivative [Line Items] |
Notional quantity (MW-hrs) | MWh | 4,585,008
Receive average prices (per MW-hr) | $ / MWh | 24.54
PJM Western HUB, Expiry December 2028 |
Derivative [Line Items] |
Notional quantity (MW-hrs) | MWh | 527,931
Receive average prices (per MW-hr) | $ / MWh | 32.11
NI HUB, Expiry December 2027 |
Derivative [Line Items] |
Notional quantity (MW-hrs) | MWh | 2,465,763
Receive average prices (per MW-hr) | $ / MWh | 23.67
ERCOT North HUB, Expiry December 2027 |
Derivative [Line Items] |
Notional quantity (MW-hrs) | MWh | 1,998,095
Receive average prices (per MW-hr) | $ / MWh | 36.46
Salisbury, Expiry February 2022 |
Derivative [Line Items] |
Notional quantity (MW-hrs) | MWh | 11,328
Receive average prices (per MW-hr) | $ / MWh | 38.95

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